Silent gear and method of making the same



July 21, 1925.

R. STRESAU GEAR AND METHOD OF MAKING THE SAME SILENT Filed May 5l, 1921 enana orties.

RICHARD STBESAU, 0F VIAUATOSA., WISCONSIN.

SILENT Cil'fllviJ AND R'QETHOD OF MAKING TE SAME Application tiled May 31, 1921, Serial No. 473,728.

To all whom t may conce/raf Be it lznoivn that I, Bici-amro ,grassi-fm, a citizen oit' the United States, residing in the city oic llauwatosa, in the county of Mil- Waukee and State ot lflilisconsin, have in vented a certain new and useful improvement in Silent Gears and Methods ot lialiing the Same; and I do declare the :following to be a` clear, enact, and complete description thereof, such as Will enable persons skilled in the art to which the invention relates to malte and use the saine. reference being had to the accompanying drawing as showing constructions in Which my invention has been embodied.

My invention relates to a. novel construction or" laminated spur gears which are silent in operation. and to the method ot manufacturing such gears.

The invention is embodied in a gear which is composed ot a plurality ot superposed or laminated discs each of which is termed as a completed gear section With peripheral teeth, a suitable number ot which sections are assembled and permanently secured together in such manner as to constitute a unitary gear structure having a tace of the desired vvidth, With the teeth ot the gear sections staggered with relation to each other.

propose to embody my method ot maling gears in structures for Which the complete toothed gear sections are punched from steel plates, and atterassemblv oi the sections are secured together to torm the unit with the teeth staggered on the longitudinal sur'liace of the Igear, inasmuch as my novel process comprises the construction of gears made up from previously prepared complete toothed sections, which latter are united in sutlicient number to iorm a gear having a tace ot the desired Width. The gist of my invention resides in the plan ot producing' gear units by assembling a plurality of previously prepared complete gear sections and laminating and connecting such sections so as to produce a unitary gear structure With teeth on the sections staggered or offset on contiguous circumferential lines in which the usual operations ot generating the teeth avoided. thereby materially reducing the production cost ot gears With peripheral teeth.

ln the manufacture oit my improved gear, the sections are blanlted 'trom sheets ot steel of suitable gauge. by dies which produce gear sections which are lcomplete in themselves, and which it is not necesary to subject to any further milling operations to effect the formation of the teeth ot the gear. The dies Which are employed to punch out the gear sections, also produce in each section a central opening ofappropriate diameter for the reception of the shaft upon which the gear is to be mounted, and rivet holes it' the sections are to be .united by means ot' rivets. y

In producing gears with staggeredteeth, the pitch lines of the teeth Will be'divided by the number ot sections embodied in the unit'ot construction, and the ,teeth of the several assembled sections ot the yunit Will be staggered With relation to the adjacent sections, in laccordance With such division and in order that the staggered order of the .toothed gear sections may b e established, a circular rou7 ot rivet holes is provided in eachV gear section, such holes being preferably equidistant in each section, but varying progressively in each succeeding section with the division of the pitch lines.

In such gears, the relation of thel rivet holes to the teeth varying in the several sections, it will be seen that when the holes in the. several sections comprising the unit are aligned for the insertion of the rivets, it follows that the teeth oi the sections constituting the gear unit are progressively advanced and staggered with relation to each other, so that when riveted together the teeth are set in the order desired and as described.

Thus, l may produce-a gear the teeth of which are staggered in circumferential sections, and this is achieved Without resort to the usual costly milling roperations heretofore attendant upon the production ot' such gears. y Y

As an alternative construction, l may dispense with the provision of theJ circular row of rivet holes in each oin the gear sections, and instead cut a key seat therein, the location of which vvill vary in the samemanner in its relation to the teeth of the gear sections, and after alignment of the sections by means of the key seat, may unite the sections by spot Welding such sections together to constituteva unitary structure.' V

The novel features residing in my inven` tion will be pointed out in the appended claims.

In the drawing att-ached to this specifica-- tion, Figure l is a perspective vlew showing.

a? gear-.producedinaccordance with my invention.

Fig. 2 is a diagram showing the production of gear sections of uniform construction, but in which sections the arrangement of the rivet holesin relation to the teeth ot the gear sections is varied, so that when the said holes are aligned for the insertionot the rivets, the teeth of the sections will assume a staggered position with relation to each other.

v Fig. 3' shows a modification in the method of manufacture, in which a key seat in the gear sections is provided for securing the V alignment of the sections With 'a resultant staggering oi the teeth oil the gear.

Fig. i is a central longitudinal sectional vievv showing the manner in Which the gear sections are connected together by means of rivets 5 andv 'Y Fig. 5 is a lsimilar' View shoiving such sections as united byk spot Welding] l Incarryingoutmy invention, l equip an ordinary blankingpress with dies suitably configured to punch from a steel plate, complete gear sections 10 each having finished teeth 1l of the desired pitch. Each gear section is provided with a center opening 12, for the reception of the shaft upon which the gear is mounted. For the purpose of secur- 'ing the gear sections into a unit, l provide each of them With a circular row oi: rivet holes 13, which are preferably equally spaced in the circle which they form.

In producingvgears With staggered teeth, the position of the holes in the several gear sections with relation to the teeth of the sections will. progressively advancein the manner shown in Fig. 2, wherein the arrangement of suchholes in the severalblanks is shown as conforming to divisions of the pitch lines of the teeth of the gear sections. To produce this progressive order ot the rivet holes, it is necessary that the dies of the press be provided with correspondingly arrangedv punches, which `in the separate dies ivill bear the necessary relation to the ,teeth oi the gear sections.

' l/Vhen the' several gear sections constituting a unit are assembled by super-posing or laminating, With the vrivet holes in the several sections aligned for theY insertion of the .rivets by means oi Which the sections of the unit are connected together, .the teeth AVof ythe sections Will assume the proper relation with .reference to each other. 'l/Vhen the rivets are inserted and headed, ,a gear unit y of the construction conventionally'shown in Fig. l will be produced, which figure shows the teeth of the. gear as staggered:

, By folloyving rthe procedure" ontlined, I have vbeen enabled to produce a silent .running gear, and I achieve this very desirable result Without resorting to the c utomary practiceo generating the teeth by millinO'.

Thus I produce an eiiicient gearstructure ofthe class described at a great economy in the cost of manufacture.

I have found that the vibrations incident to the operation oit the gear structure may be broken by coating-the contiguous sides of the sections with an elastic enamel, the use of which Will be contributory to the noiseless running of the gear.

As an alternative, l can dispense With the rivet holes 13, in the gear sections, and cut a key seat 14 inthe said sections. The position or arrangement ot this key seat Will vary in its relation tothe teeth ot the gear in the same manner as previously described. The gear sections constituting the unit will be assembled With the key seats in valignment and thus the staggered effect of :the teeth of the gear Will be produced. Laminated yor superposed sections, not provided` With rivet holes, maybe united by spot Welding, as indicated at l5 in Fig. 5, so that such sections vvill be connected into a unitary structure as before.

In making a plain spur gear, the teethof the several component sections may lbe aligned by any suitable means, in the absence of rivet holes, betorev Welding thesections together. i y

Having thus described my invention, vWhat I claim and desire to secure by Letters Patent of the United States, is: A

l. A laminated silent gear I,composed of a plurality of gear sections, the teeth of Which are staggered With relation to each other, the said sections being` coated on their sides vvith an elastic enameland securedj together to constitute a unitary structure. y

2. laminatedvsilent gear composed of a plurality of gear sections, each coated on their sides 4with an elastic enamel. and provided With aligning means, ivhereby the teeth of the sections are staggered with relation to .each other when the said sectionsr are assembled, andmeans for securingrth sections to constitute a gear unit. l

ed of a 3. A. laminated silent gear compos plurality of sections each coated ,onn their sides With an elastic enamel and provided With teeth and aligning means, the relation vof the latter the teeth varying progressively in the several sections, Where'- fby When alignment vof `the sections is -made the teeth of the sections are staggered With relation to each other in the gear unit.v

4;. ,laminated silent gear composed of a plurality of sections each coated on their sides With an elastic enamel and provided With teeth and rivet holes., the relation of the latter to the teeth varying progressively in the several sections, whereby When rivets are inserted inthe aligned holes the teeth Iof the sections are staggered in the assembled gear nnit. 'i

5. vThe method of manufacturing silent gears, which comprises the steps of blanking in a single operation gear sections each provided With teeth and aligning means, placing an elastic enamel upon the contacting sides of such gear sections, the latter being differently arranged in the several sections with relation to the teeth thereof, assembling the sections by alignment of the means therein provided to effect staggering of the gear teeth, and uniting the sections into a unitary structure With the teeth thereof staggered with relation to each other.

(5. The method of manufacturing silent gears, Which comprises the steps of blanking in a single operation gear sections each provided with teeth and rivet holes, placing an elastic enamel upon the contacting sides of such gear sections, the latter being progressively arranged in the several sections with relation to the teeth thereof, assembling the sections with the rivet holes in alignment to eect staggering of the gear teeth, and uniting the sections into a unitary structure by means of rivets With the teeth thereof staggered With relation to each other.

In testimony whereof, I have signed my name at Milwaukee, this 27th day of May, 1921.

R. STRESAU. Witnesses:

W. F. WOOLARD, W. E. REUSS. 

